#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
int main()
{
	int a, b, c;
	while (scanf("%d %d %d", &a, &b, &c) != EOF)
	{
		if ((a + b > c) && (a + c > b) && (b + c > a))
		{
			if (a == b && b == c)
			{
				printf("Equilateral triangle!\n");
			}
			else if ((a == b) && (b != c) || (a == c) && (b != c))
			{
				printf("Isosceles triangle!");
			}
			else
			{
				printf("Ordinary triangle!");
			}
		}
		else
		{
			printf("Not a triangle!");
		}
	}
		return 0;
}